fixed disabled concurrency in CLI

examples/pi-bench.lyng

@@ -50,13 +50,10 @@ fn piSpigot(iThread: Int, n: Int) {
     println(iThread, " - done: ", s)
 }
 
-
 var counter = 0
 
-
-for( repeat in 1..30) {
 val t0 = Instant()
-    (1..TASK_COUNT).map {
+(1..TASK_COUNT).map { n ->
     val counterState = counter
     val t = launch {
         piSpigot(counterState, WORK_SIZE)
@@ -67,6 +64,4 @@ for( repeat in 1..30) {
 
 val dt = Instant() - t0
 
-    println("$repeat: all done, dt = ", dt)
+println("all done, dt = ", dt)
-    delay(1000)
-}

lyng/src/commonMain/kotlin/Common.kt

@@ -26,7 +26,9 @@ import com.github.ajalt.clikt.parameters.arguments.multiple
 import com.github.ajalt.clikt.parameters.arguments.optional
 import com.github.ajalt.clikt.parameters.options.flag
 import com.github.ajalt.clikt.parameters.options.option
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.runBlocking
+import kotlinx.coroutines.withContext
 import net.sergeych.lyng.EvalSession
 import net.sergeych.lyng.LyngVersion
 import net.sergeych.lyng.Script
@@ -245,12 +247,17 @@ fun executeFileWithArgs(fileName: String, args: List<String>) {
 suspend fun executeSource(source: Source) {
     val session = EvalSession(baseScopeDefer.await())
     try {
-        session.eval(source)
+        evalOnCliDispatcher(session, source)
     } finally {
         session.cancelAndJoin()
     }
 }
 
+internal suspend fun evalOnCliDispatcher(session: EvalSession, source: Source): Obj =
+    withContext(Dispatchers.Default) {
+        session.eval(source)
+    }
+
 suspend fun executeFile(fileName: String) {
     var text = FileSystem.SYSTEM.source(fileName.toPath()).use { fileSource ->
         fileSource.buffer().use { bs ->

lyng/src/jvmTest/kotlin/net/sergeych/CliDispatcherJvmTest.kt

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+package net.sergeych
+
+import kotlinx.coroutines.runBlocking
+import net.sergeych.lyng.EvalSession
+import net.sergeych.lyng.Script
+import net.sergeych.lyng.Source
+import net.sergeych.lyng.obj.ObjList
+import net.sergeych.lyng.obj.ObjString
+import org.junit.Test
+import kotlin.test.assertNotEquals
+
+class CliDispatcherJvmTest {
+    @Test
+    fun executeSourceRunsOnDefaultDispatcher() = runBlocking {
+        val callerThread = Thread.currentThread()
+        val callerThreadKey = "${System.identityHashCode(callerThread)}:${callerThread.name}"
+        val scope = Script.newScope().apply {
+            addFn("threadKey") { ObjString("${System.identityHashCode(Thread.currentThread())}:${Thread.currentThread().name}") }
+            addFn("threadName") { ObjString(Thread.currentThread().name) }
+        }
+        val session = EvalSession(scope)
+
+        try {
+            val result = evalOnCliDispatcher(
+                session,
+                Source(
+                    "<test>",
+                    """
+                    val task = launch { [threadKey(), threadName()] }
+                    val child = task.await()
+                    [threadKey(), threadName(), child]
+                    """.trimIndent()
+                )
+            ) as ObjList
+
+            val topLevelThreadKey = (result.list[0] as ObjString).value
+            val topLevelThreadName = (result.list[1] as ObjString).value
+            val child = result.list[2] as ObjList
+            val childThreadKey = (child.list[0] as ObjString).value
+            val childThreadName = (child.list[1] as ObjString).value
+
+            assertNotEquals(
+                callerThreadKey,
+                topLevelThreadKey,
+                "CLI top-level script body should not run on the runBlocking caller thread: $topLevelThreadName"
+            )
+            assertNotEquals(
+                callerThreadKey,
+                childThreadKey,
+                "CLI launch child should not inherit the runBlocking caller thread: $childThreadName"
+            )
+        } finally {
+            session.cancelAndJoin()
+        }
+    }
+}

lynglib/build.gradle.kts

@@ -21,7 +21,7 @@ import org.jetbrains.kotlin.gradle.ExperimentalWasmDsl
 import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 
 group = "net.sergeych"
-version = "1.5.4"
+version = "1.5.4-SNAPSHOT"
 
 // Removed legacy buildscript classpath declarations; plugins are applied via the plugins DSL below